Astronomy Is Written For Astronomers

In First Place We Must Observe That The Universe Is Spherical. This Is Either Because That Figure Is The Most Perfect, As Not Being Articulated, But Whole And Complete In Itself; Or Because It Is The Most Capacious And Therefore Best Suited For That Which Is To Contain And Preserve All Things.

First Of All, We Must Note That The Universe Is Spherical.

Therefore, Having Obtained The Opportunity From These Sources, I Too Began To Consider The Mobility Of The Earth.

To Know That We Know What We Know, And To Know That We Do Not Know What We Do Not Know, That Is True Knowledge.

To Know The Mighty Works Of God, To Comprehend His Wisdom And Majesty And Power; To Appreciate, In Degree, The Wonderful Workings Of His Laws, Surely All This Must Be A Pleasing And Acceptable Mode Of Worship To The Most High, To Whom Ignorance Cannot Be More Grateful Than Knowledge.